Backpack



FIG. 1 is a front perspective view of a backpack, showing my design.

FIG. 2 is a rear perspective view thereof.

FIG. 3 is a front elevation view thereof.

FIG. 4 is a rear elevation view thereof.

FIG. 5 is a left side elevation view thereof.

FIG. 6 is a right side elevation view thereof.

FIG. 7 is a top plan view thereof.

FIG. 8 is a bottom plan view thereof; and,

FIG. 9 is a perspective view of the backpack with shoulder zipper closed.

The broken lines depict portions of the backpack and form no part of the claim. 

CLAIM The ornamental design for a backpack, as shown and described. 